*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19801
19810
19820
19830
19840
19850
19860
19874
19880
19890
19900
19910
19922
19932
19941
19958
19962
19970
199813
19992
20000
20019
20020
20035
20042
20052
20061
20071
20088
20091
201022
201131
20122
20133
20148
20156
201613
20170
20180
Total149