• 1.12.1 – 727
• 1.11.2 – 1,967
• 1.10.2 – 2,776
• 1.9.4 – 1,291
• 1.8.9 – 1,377
• 1.7.10 – 4,403
• 1.6.4 – 807
• 1.5.2 – 339
• 1.4.7 – 100
• 1.3.2 – 37
• 1.2.5 – 42
• 1.1 – 17

Total: 13,883

Many mods are multi-version so the actual total number of mods is lower. Also there are more mods available outside of Curse network, and it took a while for them to get popular, there were much more mods available in older versions as opposed to what the low numbers from 1.1 to 1.5.2 would suggest.