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*Excludes Observations that spanned multiple years

Pre 19701
19700
19711
197211
197318
19740
19750
19760
19770
19780
19791
19800
19810
19820
19830
19840
19850
19860
19871
198829
19899
199016
199179
199216
19938
19945
19950
199610
199715
19980
19993
20000
20010
20020
20030
20042
20050
20065
20073
200810
200910
20101
20110
20120
20132
20140
20152
20169
20171
20180
20197
20200
20210
Total275