*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19751
19760
19770
19785
19793
19800
19810
19823
19830
19843
19852
19861
19871
19885
19893
19908
19919
19924
19937
199410
19957
199616
199731
199822
199928
200077
200136
200232
200370
200457
200584
200686
200779
200866
2009114
2010147
2011122
2012119
201389
2014141
2015131
201636
20170
20180
Total1655