I won't hotlink here but it's well worth a look on the century China forum
1991
PLAN in 1991
2001
PLAN in 2001
2011
PLAN in 2011
1991
PLAN in 1991
2001
PLAN in 2001
2011
PLAN in 2011
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There is a typo where it should say 2001 instand of 2011.
actually you posted two 2011s in the first thread.

It really is a big change.
btw do Z-9 actually exists in 1991? It was put in the PLAAF 1991 post but I thought it was much more recent.
The first Z-9 flew in 1981, and was built in China from components supplied by Aérospatiale. On 16 January 1992, the indigenous variant Z-9B, constructed with 70% Chinese-made parts, flew successfully. The flight test was completed in November, 1992 and the design was finalized a month later. Z-9B production began in 1993 and entered PLA service in 1994. [2]
Nice, the PLA equipment from 2011 to 2021 will even be a greater leap.