*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
199116
19920
19935
19940
19951
19961
19971
19980
19991
20000
20018
20020
20030
20042
20050
20060
20070
20081
20091
20101
20112
20120
20130
20140
20151
20160
20171
20180
20190
20200
20210
20221
20230
20240
Total43