*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19751
19761
19770
19780
19791
19801
19810
19820
19830
19841
19850
19861
19870
198812
19891
19900
19910
19921
199321
19947
19956
19963
19970
19980
19991
20000
20018
20025
20030
20040
20050
20062
20070
20086
20092
201016
201125
20120
20132
20144
20152
201611
20174
20185
20199
20200
20210
20220
Total159