*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19901
19910
19923
19932
19945
19954
19963
19971
19980
19991
20007
20016
20020
20034
20045
20053
200614
20072
200830
20094
20103
20113
20121
20139
20140
20150
20160
20170
Total111