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*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
198952
199013
19910
19920
19931
19940
19955
19963
19972
19980
19991
20000
200140
200212
20033
20041
20050
20060
20070
20081
20091
20104
20110
20121
20130
20140
20150
20160
20170
20180
20190
20200
20210
Total140