user
Instruction
Answer the question based on the provided table.


Table
Table Title: doctorate-holding nonfaculty researchers in science, engineering, and health fields, by sex and broad field: 2017-19
Table Content:
<table border="1" cellspacing="0">
<tr> <td> broad field </td> <td> 2017 </td> <td> 2018 </td> <td> 2019 </td> <td>  </td> </tr>
<tr> <td> all surveyed fields </td> <td> 28180 </td> <td> 29284 </td> <td> 30349 </td> <td> 7.7 </td> </tr>
<tr> <td> male </td> <td> 16580 </td> <td> 17468 </td> <td> 17980 </td> <td> 8.4 </td> </tr>
<tr> <td> female </td> <td> 11600 </td> <td> 11816 </td> <td> 12369 </td> <td> 6.6 </td> </tr>
<tr> <td> science and engineering </td> <td> 20542 </td> <td> 21848 </td> <td> 22728 </td> <td> 10.6 </td> </tr>
<tr> <td> science </td> <td> 17268 </td> <td> 18278 </td> <td> 18819 </td> <td> 9 </td> </tr>
<tr> <td> agricultural sciences </td> <td> 496 </td> <td> 565 </td> <td> 645 </td> <td> 30 </td> </tr>
<tr> <td> biological and biomedical sciences </td> <td> 8203 </td> <td> 8250 </td> <td> 8229 </td> <td> 0.3 </td> </tr>
<tr> <td> computer and information sciences </td> <td> 476 </td> <td> 515 </td> <td> 510 </td> <td> 7.1 </td> </tr>
<tr> <td>  </td> <td> 1794 </td> <td> 2106 </td> <td> 2177 </td> <td> 21.3 </td> </tr>
<tr> <td> mathematics and statistics </td> <td> 240 </td> <td> 266 </td> <td> 305 </td> <td> 27.1 </td> </tr>
<tr> <td> multidisciplinary and interdisciplinary studies </td> <td> 806 </td> <td> 832 </td> <td> 820 </td> <td> 1.7 </td> </tr>
<tr> <td> natural resources and conservation </td> <td> 364 </td> <td> 580 </td> <td> 582 </td> <td> 59.9 </td> </tr>
<tr> <td> physical sciences </td> <td> 2871 </td> <td> 3056 </td> <td> 3316 </td> <td> 15.5 </td> </tr>
<tr> <td> psychology </td> <td> 494 </td> <td> 507 </td> <td> 576 </td> <td> 16.6 </td> </tr>
<tr> <td> social sciences </td> <td> 1524 </td> <td> 1601 </td> <td> 1659 </td> <td> 8.9 </td> </tr>
<tr> <td> engineering </td> <td> 3274 </td> <td> 3570 </td> <td> 3909 </td> <td> 19.4 </td> </tr>
<tr> <td> bioengineering and biomedical engineering </td> <td> 415 </td> <td> 440 </td> <td> 492 </td> <td> 18.6 </td> </tr>
<tr> <td> chemical engineering </td> <td> 281 </td> <td> 257 </td> <td> 328 </td> <td> 16.7 </td> </tr>
<tr> <td> civil engineering </td> <td> 422 </td> <td> 414 </td> <td> 492 </td> <td> 16.6 </td> </tr>
<tr> <td>  </td> <td> 557 </td> <td> 588 </td> <td> 637 </td> <td> 14.4 </td> </tr>
<tr> <td> engineering science, mechanics, and physics </td> <td> 200 </td> <td> 220 </td> <td> 186 </td> <td> -7 </td> </tr>
<tr> <td> industrial and manufacturing engineering </td> <td> 119 </td> <td> 105 </td> <td> 137 </td> <td> 15.1 </td> </tr>
<tr> <td> mechanical engineering </td> <td> 458 </td> <td> 489 </td> <td> 531 </td> <td> 15.9 </td> </tr>
<tr> <td> metallurgical and materials engineering </td> <td> 181 </td> <td> 215 </td> <td> 242 </td> <td> 33.7 </td> </tr>
<tr> <td> other engineeringa </td> <td> 641 </td> <td> 842 </td> <td> 864 </td> <td> 34.8 </td> </tr>
<tr> <td> health </td> <td> 7638 </td> <td> 7436 </td> <td> 7621 </td> <td> -0.2 </td> </tr>
<tr> <td> clinical medicine </td> <td> 6448 </td> <td> 6159 </td> <td> 6273 </td> <td> -2.7 </td> </tr>
<tr> <td> other health </td> <td> 1190 </td> <td> 1277 </td> <td> 1348 </td> <td> 13.3 </td> </tr>
</table>


Question
rates of growth in the number of nfrs between 2017 and 2019 in various s&e fields of research varied widely, which broad field had the largest percentage of increasing?


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