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*Excludes Observations that spanned multiple years

Pre 19702
19700
19710
19720
19730
19740
19750
19761
19770
19780
19790
19800
19810
19820
19831
19840
19850
19863
19870
19881
19890
19900
19911
19920
19930
19940
19951
19960
19970
19980
19990
20000
20010
20020
20030
20040
20051
20062
20070
20080
20090
20100
20114
20120
20130
20140
20150
20160
20170
20180
20190
20200
20210
Total17