| 1 | A | B | C | D | E | F | G | H | I | J | K |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 2 | primary work activities among u.s.-trained seh doctorate holders residing in the united states, by sex: 1997 and 2017 |  |  |  |  |  |  |  |  |  |  |
| 3 | primary work activity | 1997 |  |  |  |  | 2017 |  |  |  |  |
| 4 |  | total | male |  | female |  | total | male |  | female |  |
| 5 |  | employed | number | % | number | % | employed | number | % | number | % |
| 6 | primary work activity, totala | 518450 | 399100 | 77 | 119350 | 23 | 815100 | 527850 | 64.8 | 287250 | 35.2 |
| 7 | research and development | 210850 | 170150 | 80.7 | 40700 | 19.3 | 338500 | 237550 | 70.2 | 100950 | 29.8 |
| 8 | basic research | 69200 | 52950 | 76.5 | 16300 | 23.5 | 90250 | 61550 | 68.2 | 28750 | 31.8 |
| 9 | applied research | 100750 | 81350 | 80.8 | 19350 | 19.2 | 159200 | 107400 | 67.5 | 51800 | 32.5 |
| 10 | development | 28800 | 24900 | 86.5 | 3900 | 13.5 | 65550 | 49350 | 75.3 | 16200 | 24.7 |
| 11 | design | 12100 | 10950 | 90.4 | 1150 | 9.6 | 23500 | 19250 | 82.1 | 4200 | 17.9 |
| 12 | managing or supervising people or projects | 58550 | 48150 | 82.2 | 10400 | 17.8 | 119050 | 77550 | 65.1 | 41500 | 34.9 |
| 13 | professional servicesb | 61100 | 36850 | 60.3 | 24250 | 39.7 | 97450 | 49750 | 51 | 47700 | 49 |
| 14 | teaching | 113050 | 83550 | 73.9 | 29500 | 26.1 | 153450 | 89150 | 58.1 | 64300 | 41.9 |
| 15 | all other primary work activitiesc | 74900 | 60450 | 80.7 | 14500 | 19.3 | 106650 | 73850 | 69.2 | 32800 | 30.8 |

Question: in 2017, how many percent of u.s.-trained seh doctorate holders performing an r&d activity as their primary work activity were women?
Answer: 29.8

Question: in 1997, how many percent of u.s.-trained seh doctorate holders performing an r&d activity as their primary work activity were women?
Answer: 19.3