*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
198411
19850
19862
19872
19880
19890
19902
19910
19920
19930
19940
19950
19960
19970
19981
19990
20003
20011
20021
20030
20040
20050
20061
20070
20080
20092
20100
20113
20121
20131
20143
20150
20160
20171
20180
Total35