*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19781
19791
19800
19810
19821
19834
19840
19850
19862
19870
19880
198914
19900
19910
199222
19930
19940
19950
19960
19975
19981
19991
20001
20011
20020
20030
20041
20052
20062
20070
20080
20090
20100
20113
20120
20130
20140
20150
20160
20170
Total62