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*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19743
19751
19760
19770
19781
19791
19800
19810
19820
19831
19841
19850
19860
19873
19881
19890
19900
19911
19920
19930
19941
19951
199618
199722
19981
19994
20000
20011
20023
20030
20040
20050
20060
20070
20083
20090
20100
20115
20122
20130
20141
20150
20166
20172
20184
20191
20200
20210
Total88