*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19742
19753
19760
19770
19780
19791
19803
19810
19820
19831
19842
19853
19860
19870
19880
19890
19900
19910
19920
19930
19941
19950
19963
19970
19980
19991
20000
20010
20022
20030
20040
20050
20060
20071
20080
20090
20108
20116
20121
20131
20140
20150
20160
20170
20180
20190
20200
Total39