*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19871
19882
19890
19901
19917
19926
19932
19940
19952
19960
19970
19980
199929
200026
20012
20022
20030
20040
20051
20061
20072
20081
20091
20103
20111
20122
20136
20142
20150
201610
20175
20189
20190
20200
20210
20220
Total124