*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19781
19790
19800
19810
19820
19830
19840
19850
19860
19870
19881
19890
19900
19912
19920
19930
19941
19952
19960
19971
19980
19992
20000
20010
20020
20030
20040
20050
20060
20071
20080
20090
201013
201126
20120
20134
201478
201549
2016107
20177
20185
201929
202019
202147
202236
202332
202420
Total484