I was discussing this trend with a few friends in a Twitter Space a couple of days ago. There is a very popular myth in Punjab that Punjab is way more prosperous than rest of India and that rest of India is kinda dependent on Punjab for survival. Here are a few facts:
(1/)

Punjab's NSDP per Capita in 1996 - Rs 17353 (Rank: 7)
Haryana in 1996: Rs 16611 (Rank:8)

By 2006, PB slipped to 11th rank with per capita NSDP of Rs 36199 and is overtaken by states like Maharashtra, Gujarat, HP etc. Haryana climbs to 6th rank with per capita NDPS of 42309 (2/)

Between 2000-2010, Sikkim recorded maximum growth rate of 577%, Uttarakhand 466%, MH 375%, GJ 321%, Goa 284%, Haryana 266%! While Punjab recorded a growth rate of mere 149%, 2nd last from bottom, just above Manipur (130%) which by the way suffers from raging insurgency. (3/)

FF to 2021, Haryana is ranked 5th with per capita NSDP of 2,63,649 while Punjab slipped to 19th pos with a per capita NSDP of 1,72,340. Between 2010 - 2020, PB recorded a growth of mere 157%, just above CG, JH and Meghalaya. (4/)

And, this is not due to some grand Sazish from someone! Punjab did well until the 80s, due to high growth rates following the green rev. Despite the turmoil and violence in 80s and 90s, Pb continued to reap benefits of Green Rev, well into the 90s. (5/)