*Excludes Observations that spanned multiple years

Pre 19705
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19923
19930
19941
19950
19960
19970
19982
19998
20000
20010
20020
200316
20044
20056
20067
20070
20085
200912
20105
20113
201227
201324
201445
20159
20161
20171
Total184