*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19920
19930
19940
19950
19960
19970
19980
19990
20000
20010
20021
20033
20044
20055
20060
20073
20084
20090
20104
20114
20127
20133
20141
20150
20160
20170
20180
20191
20200
20210
20220
20230
20240
Total41