*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19841
19850
19860
19870
19889
19890
19902
19911
199214
199327
19940
199533
19961
19972
199812
19993
20004
20011
20020
20030
20040
20050
20063
20071
20082
20091
20101
20111
20120
20131
20140
20150
20162
20171
20180
20190
20200
20210
20220
Total124