*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19802
19810
19820
19835
19840
19850
19869
19870
19880
19891
19901
19910
19925
19934
19943
19955
19961
19972
19982
19990
20000
20016
20021
20032
200444
20056
20063
20070
200815
20093
201024
201133
20121
20137
20144
201515
201623
201714
20180
Total242