*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19781
19790
19800
19810
19821
19830
19840
198548
198612
198719
1988102
198921
199017
199132
199219
199379
199415
199594
199654
199733
19982
199918
200011
200113
20025
200352
200456
200535
200636
200741
200866
200961
201068
201144
201229
201354
201453
201556
201648
201745
201858
201966
202042
202176
202278
202310
20242
Total1673