*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19782
19790
19801
19810
19821
19830
19841
19855
19860
19875
19883
19893
19902
19912
199212
19938
19944
19951
19968
19973
19984
19998
200010
20011
20021
20031
20041
20057
20061
20072
20081
20092
20101
20114
201217
201311
20143
20151
20161
20172
20182
20190
20200
20210
20220
Total142