*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19831
19841
19850
19861
19870
19880
19890
19900
19910
19920
19930
19940
19951
19960
19972
19982
19995
20000
20010
20027
20035
20048
20051
20062
20071
20081
20091
20100
20110
20122
20131
20142
20151
20160
20170
20180
Total45