*Excludes Observations that spanned multiple years

Pre 19701
19701
19711
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19852
19864
19870
19881
19890
199010
199131
199211
199339
19941
199552
19968
19974
199813
19993
20000
20010
20020
20031
20042
20059
20061
20072
200832
20098
20102
20110
20120
20131
20140
20150
20166
20177
20181
20190
20200
20210
20220
Total254