*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
198819
19890
19900
199143
19928
19939
19940
19954
19960
19970
19980
199923
200013
200118
20023
20030
20044
20050
20061
20070
20084
20090
201012
20119
20121
20130
20141
20151
20161
20173
20180
201910
20206
20215
20226
20236
20245
Total216