*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19751
19762
19770
19780
19790
19800
19810
19820
19830
19840
19850
19861
19870
19880
19890
19900
19910
19920
19932
19943
19950
19961
19974
19982
199913
200020
200114
200214
200335
200447
2005102
200628
20077
20081
200912
201032
20113
20120
20130
20140
201523
20160
20170
20180
Total367