Starting 2008, NIFTY50 has gained 3000 pts two years lesser

Starting 2008, NIFTY50 has gained 3000 pts a year lesser. From 2008 to 2015 , 2015 to 2020 , Post covid boost added 3000 pts in just 2 years which was NOT linear hence resulting into a meltdown in 2022. Ideally, 2020 to 2024 should have added another 3000 pts, taking NIFTY to 18500. As of today, NIFTY is at 15800 which should reach 18500 around June 2024. If a similar linear growth continues, which it will (regardless of the macros), we can see NIFTY around 24-25k in 2030.