*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19920
19930
19940
19956
19960
19970
19980
19990
20000
20010
20020
20034
20040
20051
20063
20073
20086
20091
201018
201115
20122
20131
20143
20151
20165
20174
20186
201910
20208
202112
202213
20236
202411
Total139