*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19831
19840
19850
19860
19870
19881
19890
19901
199114
19923
19934
19941
199521
19960
19971
19981
19991
20000
20011
20020
20030
20043
20051
20060
20070
20083
20090
20101
20110
20120
20130
20140
20150
20161
201710
20180
20192
20203
20211
20225
20230
20240
Total80