*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
19871
19880
19890
19900
19910
19920
19930
19940
19950
19960
19970
19980
19991
20001
20011
20020
20031
20041
20051
20061
20073
20081
20090
20101
20110
20123
20130
20140
20150
20161
20170
20180
20191
20200
20210
20222
20234
20241
Total26