*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19743
19750
19760
19770
19781
19790
19800
19810
19820
19830
19840
19850
19861
19870
19880
19890
19901
19910
19920
19930
19941
19953
19961
19970
19980
19991
20000
20010
20020
20030
20040
20051
20060
20071
20081
20091
20101
20110
20120
20130
20140
20151
20163
20171
20180
20190
20201
20210
20220
20230
20242
Total25