2015-16 NBA Regular Season Top 10 Total 3-Point Field Goals Made (source: basketball-reference leaders page via Google Translate)
1. Stephen Curry (GSW) - 402
2. Klay Thompson (GSW) - 276
3. James Harden (HOU) - 236
4. Damian Lillard (POR) - 229
5. Kyle Lowry (TOR) - 212
6. Paul George (IND) - 210
7. J.R. Smith (CLE) - 204
8. JJ Redick (LAC) - 200
9. CJ McCollum (POR) - 197
10. Wesley Matthews (DAL) - 189
Average made by those 10 players: 235.5
Difference between Curry and average: 166.5 (402 - 235.5)
Curry made 70.7% more than the average: (166.5 / 235.5) x 100 = 70.7%.