*Excludes Observations that spanned multiple years

Pre 19707
19701
19710
19720
19731
19741
19750
19760
19775
19780
19790
19800
19810
19820
19830
19841
19854
19868
19878
198880
19894
19904
1991113
1992117
199370
199422
199528
199613
19978
19984
199955
200058
200152
200222
200310
200458
20053
200610
200773
20088
20095
20106
20118
20122
201319
20145
20152
201613
20176
20186
201913
202013
202112
20229
20231
20240
Total968