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*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19801
19810
19820
19830
19841
19851
19860
19874
19880
19890
19903
199144
199213
199314
199410
199510
199635
19976
19981
19990
20007
20010
200211
200314
20044
20051
20062
20072
200811
20096
20101
20112
20121
20131
20141
20151
20163
20170
20187
20190
20200
20210
Total218