user
Instruction
Answer the question based on the provided table.


Table
Table Title: singles
Table Content:
<table border="1" cellspacing="0">
<tr> <td rowspan="2"> year </td> <td rowspan="2"> title </td> <td colspan="9"> peak </td> <td rowspan="2"> album </td> </tr>
<tr> <td> swe </td> <td> nor </td> <td> fin </td> <td> den </td> <td> bel </td> <td> uk </td> <td> nl </td> <td> ch </td> <td> hu </td> </tr>
<tr> <td rowspan="2"> 1999 </td> <td> take me to your heaven </td> <td> 2 </td> <td> 10 </td> <td> none </td> <td> none </td> <td> 5 </td> <td> 20 </td> <td> 23 </td> <td> none </td> <td> none </td> <td rowspan="3"> charlotte </td> </tr>
<tr> <td> i write you a lovesong </td> <td> 38 </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> </tr>
<tr> <td> 2000 </td> <td> damn you </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> </tr>
<tr> <td rowspan="2"> 2001 </td> <td> you got me going crazy </td> <td> 20 </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td rowspan="2"> miss jealousy </td> </tr>
<tr> <td> miss jealousy </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> </tr>
<tr> <td> 2003 </td> <td> broken heart </td> <td> 7 </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td rowspan="2"> gone too long </td> </tr>
<tr> <td> 2004 </td> <td> million miles away </td> <td> 11 </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> </tr>
<tr> <td> 2006 </td> <td> "i din rost"(promo single) </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> i din rost </td> </tr>
<tr> <td> 2007 </td> <td> jag ar tillbaks </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> single only </td> </tr>
<tr> <td rowspan="2"> 2008 </td> <td> hero </td> <td> 1 </td> <td> 20 </td> <td> 18 </td> <td> 24 </td> <td> none </td> <td> none </td> <td> none </td> <td> 65 </td> <td> 4 </td> <td rowspan="2"> hero </td> </tr>
<tr> <td> bullet </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> </tr>
<tr> <td rowspan="3"> 2012 </td> <td> the girl </td> <td> 7 </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td rowspan="3"> the girl </td> </tr>
<tr> <td> little braveheart </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> </tr>
<tr> <td> just not tonight </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> </tr>
<tr> <td> 2015 </td> <td> brollopsvalsen </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> single only </td> </tr>
<tr> <td> 2016 </td> <td> har star jag </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> single only </td> </tr>
<tr> <td> 2016 </td> <td> hostens sista blomma </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td rowspan="2"> mitt liv </td> </tr>
<tr> <td> 2017 </td> <td> mitt liv </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> </tr>
<tr> <td> 2019 </td> <td> diva to diva </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> <td> none </td> </tr>
</table>


Question
when did the single "hero"release?


Answer Format
The final answer should be concise and use the following format:
```json
{
    "answer": [
        "answer1",
        "answer2",
        ...
    ]
}
```
rule
["2008.0"]