*Excludes Observations that spanned multiple years

Pre 19702
19700
19713
19720
19730
19740
19751
19760
19770
19780
19790
19800
19810
19820
19832
19842
19852
19860
198716
198839
19892
19900
199125
19925
19930
19941
199570
199617
199725
19981
199960
200049
200169
200212
20032
20046
20050
20060
20072
20082
20093
20101
20110
20121
20133
20140
20150
20161
20172
201811
201934
20204
20212
20226
20238
20240
Total491