*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
19870
19880
19890
19904
19918
19923
199315
19949
19958
19960
19970
19980
19991
20000
20010
20021
20030
20040
20050
20061
20070
20080
20090
20108
20112
20121
20134
20140
20150
20162
20170
20181
20190
20200
20210
20220
Total68