*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
19882
19890
19900
199117
19920
19930
19940
19950
19960
19970
19980
19990
20000
20012
20020
20031
20040
20050
20061
20070
20080
20090
20106
20115
20123
20135
20140
20154
20161
20172
20180
Total49