*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19731
19740
19751
19760
19770
19781
19790
19800
19810
19820
19830
19841
19854
19860
19872
19881
19897
19907
19914
19920
199317
19942
199514
19966
19976
19981
19990
20001
20010
20020
200333
200419
200515
200613
200714
20085
20095
20102
20113
20122
20135
20144
20153
20165
20170
20185
20191
20201
20211
20222
20232
20240
Total216