*Excludes Observations that spanned multiple years

Pre 19700
19700
19711
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19861
19870
19880
19891
19901
19910
19920
19930
19943
19954
19961
19974
199819
199911
20001
20015
20025
2003724
200496
2005102
200626
200716
200825
2009209
20100
20112
20120
20130
20140
20150
201612
201717
20180
Total1286