*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19831
19840
19850
19860
19874
19880
19890
19904
199115
19924
19937
19940
199516
19960
19971
19980
19992
20000
20010
20023
20030
20041
20050
20060
20071
20080
20090
20101
20111
20120
20132
20141
20152
20163
20172
201821
20190
Total92