*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19803
19810
19820
19833
19842
19850
19860
19870
19880
19890
19900
19910
19920
19930
19940
19950
19960
19971
19981
19990
20001
20010
20020
20030
20040
20050
20061
20071
20080
20090
20100
20110
20120
20130
20140
20150
20160
20173
20185
20191
20202
20213
20227
20232
20240
Total36