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*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19771
19781
19790
19800
19811
19820
19832
19840
19850
19860
19870
19880
19890
19900
19914
19921
19939
19940
19950
19960
19970
19980
19990
20000
20010
20020
20033
20040
20052
20061
20071
20081
20090
20100
20110
20120
20130
20140
20150
20160
20170
20181
20190
20201
20210
Total30