*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19801
19810
19820
19831
19840
19851
198611
19870
19880
19891
19902
19913
19920
19934
19948
199513
19961
19975
199823
19992
20007
200114
20028
20034497
2004661
20052094
2006198
2007738
2008218
20091195
201022
201117
20127
20133
20145
201515
201654
2017186
20180
Total10015