*Excludes Observations that spanned multiple years

Pre 19701
19700
19711
19720
19730
19740
19751
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19872
19889
19892
19904
199115
19920
199331
199431
1995118
199685
1997112
19983
1999103
200014
20016
200217
20039
20040
20054
20062
20072
20082
20097
20103
20110
20124
20130
20142
20157
20164
20171
20180
20192
20200
20210
20220
Total604