*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19763
19776
19780
19790
19800
19810
19820
19830
19840
19850
19861
19870
19883
19893
19900
19915
19921
19932
19948
19950
19961
19970
19982
19994
20000
20010
20021
20030
20040
20050
20060
20070
20080
20090
20100
20110
20120
20130
20140
20150
20160
20170
20180
20190
20200
20210
20220
20230
20240
Total40