*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19723
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19853
19862
19873
198810
19895
19908
199118
199214
19930
19940
19950
19960
19970
19980
19990
20000
20012
20020
20030
20041
20050
20060
20070
20080
200911
20101
20111
20123
20132
20140
20151
20165
20173
20180
20190
Total96