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*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19751
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19872
19883
19890
19903
19910
19922
19930
19943
199525
19966
19972
19981
19990
20004
20010
20023
20032
20045
20054
20060
20071
20085
20091
20101
20113
20120
20132
201415
20151
20161
20170
20180
20190
20200
20210
Total96