Oh this is fun! Bear w/ me, it's 5am here. XD NT stands for New Taipei which is what our money's called. ^__^
The 200 and 2000 is very rare; practically no vendor (which is where I do most of my shopping, when there's so many night markets and cheap places, shopping at the dept. stores is bogus xD) will take a 2000 b/c it's too hard to break (kinda like a $100 here in the US).
1, 5, 10, 20, 50. 1NT, 5NT, and the 10NT is very common, I don't think I've ever seen a 20NT, and the 50NT is also common. recently a lot of ppl don't like taking/using the 50NT b/c there's been a surge of counterfeits apparently and I was just incredulous. I've never heard of counterfeit coins before.
These are all rough estimates since the exchange rate is usually like $30-$35 or something like that.