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*Excludes Observations that spanned multiple years

Pre 19700
19700
19711
197210
19734
19740
19750
19760
19770
19780
19790
19800
19810
19820
19831
19843
19850
19860
198710
198832
19896
19905
199117
19927
199320
19947
199523
199624
199724
19980
199930
20003
20013
20023
20032
20040
20050
20060
20070
20080
20090
20100
20113
20120
20131
20141
20156
20161
20170
20181
20190
20201
20210
Total249