*Excludes Observations that spanned multiple years

Pre 19705
19700
19711
19720
19730
19740
19750
19761
19770
19780
19790
19800
19810
19821
19830
19840
198513
198629
198735
1988151
19893
199012
199155
199213
199315
199422
199552
199616
199719
19981
199963
200070
20017
200210
20036
20041
200512
20063
20074
20086
20092
201012
20112
20126
201317
20145
201512
20166
201714
201817
201912
202029
202128
202217
20236
20240
Total811