*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19821
19830
19841
19850
19860
19870
19885
19890
19900
19910
19920
19931
19945
19951
19964
19977
19982
19992
20000
20010
20020
20030
20043
20050
20060
20070
20080
200912
20100
20110
20122
20132
20142
20152
20164
201711
20183
20191
20200
20210
20220
20230
20240
Total71