*Excludes Observations that spanned multiple years

Pre 19701
19701
19710
19720
19730
19740
19750
19760
19770
19781
19790
19800
19810
19820
19830
19840
19851
19860
19876
19880
19890
19904
19910
19920
19930
19944
19951
19962
199710
19981
19991
20000
20010
20020
20039
20045
20055
20068
20078
200811
20094
201015
20119
201212
201320
20149
201512
201613
20177
20187
20193
20209
20216
20222
20232
20243
Total212