*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19753
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19905
19910
19922
19934
19940
19952
19960
19972
19981
19990
20008
20019
20029
200311
200413
20054
20062
20071
20081
20093
20101
20115
20120
20130
20140
20150
20160
20170
Total86