*Excludes Observations that spanned multiple years

Pre 19709
19700
19710
19722
19730
19741
19751
19760
19770
19780
19791
19800
19811
19820
19830
19840
19851
19860
19870
19880
19890
19903
19911
19922
19930
19940
19952
19960
19971
19980
19993
20005
20015
20024
200323
200426
200524
20063
20070
20082
20090
20100
20112
20120
20130
20140
20150
20160
20170
Total122