*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19731
19741
19750
19760
19770
19780
19791
19800
19810
19820
19831
19840
19850
19862
19870
19884
198911
19902
199111
19923
19931
19945
19955
199616
19975
19980
19992
200013
20010
20020
20031
20041
20050
20061
20071
20080
20093
20102
20113
20125
20137
20141
20150
20161
20172
20186
20190
20200
20210
20220
Total118