*Excludes Observations that spanned multiple years

Pre 197047
19700
19710
19720
19730
19741
19751
19760
19770
19780
19792
19801
19812
19822
19831
19842
19850
19860
19872
198811
19890
19900
19913
19921
19931
19946
19950
19960
19976
19980
19993
20001
20010
20020
20035
20043
20051
20062
20074
20087
20091
20105
20112
20124
20133
20144
20157
20164
20175
20187
20191
20203
20215
20229
20231
20240
Total176