*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
19882
19897
19909
19911
19924
19934
19941
19952
19961
19970
19980
19990
20000
20011
20020
20030
20042
20059
200634
20071
200819
20092
201014
201153
20124
20134
20147
20156
201613
20171
20180
Total201