*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19723
19730
19740
19750
19760
19770
19780
19794
19800
19810
19820
19830
19840
19850
19862
19878
19888
19890
19907
19912
19922
199314
19945
19953
19962
19971
19986
19991
20001
20015
20024
200311
20045
200514
200617
200715
200820
20094
201060
201163
201223
201322
201427
201516
201633
201724
20180
Total432