user
Instruction
Answer the question based on the provided table.


Table
Table Title: note 1
Table Content:
<table border="1" cellspacing="0">
<tr> <td rowspan="4">  </td> <td colspan="3"> undergraduate degree </td> <td colspan="3"> graduate degree </td> </tr>
<tr> <td rowspan="2"> unadjusted gap </td> <td colspan="2"> adjusted gap </td> <td rowspan="2"> unadjusted gap </td> <td colspan="2"> adjusted gap </td> </tr>
<tr> <td> model a </td> <td> model b </td> <td> model a </td> <td> model b </td> </tr>
<tr> <td colspan="6"> percent </td> </tr>
<tr> <td> cohort </td> <td colspan="6">  </td> </tr>
<tr> <td> 2006 </td> <td> -1.9 </td> <td> -1.8 </td> <td> -0.6 </td> <td> -5.8 </td> <td> -3.7 </td> <td> 1.7 </td> </tr>
<tr> <td> 2007 </td> <td> -0.5 </td> <td> 0.6 </td> <td> 0.7 </td> <td> -15.8 </td> <td> -13.1 </td> <td> -8.2 </td> </tr>
<tr> <td> 2008 </td> <td> .. </td> <td> .. </td> <td> .. </td> <td> .. </td> <td> .. </td> <td> .. </td> </tr>
<tr> <td> 2009 </td> <td> -7.6 </td> <td> -7.3 </td> <td> -7.8 </td> <td> -9.8 </td> <td> -8.1 </td> <td> -9.4 </td> </tr>
<tr> <td> 2010 </td> <td> -7.7 </td> <td> -7.2 </td> <td> -10.0 </td> <td> -13.6 </td> <td> -9.8 </td> <td> -8.4 </td> </tr>
<tr> <td> 2011 </td> <td> -10.1 </td> <td> -8.5 </td> <td> -11.1 </td> <td> -3.2 </td> <td> 2.1 </td> <td> 0.5 </td> </tr>
</table>


Question
even after taking demographic and field of study differences into account, how many percent of undergraduate students who graduated in 2009 earned is less than those who graduated in 2008?


Answer Format
The final answer should be concise and use the following format:
```json
{
    "answer": [
        "answer1",
        "answer2",
        ...
    ]
}
```
rule
["8.1"]