*Excludes Observations that spanned multiple years

Pre 197011
19700
19710
19720
19731
19741
19750
19760
19771
19780
19794
19801
19811
19821
19832
19840
19850
19860
19870
19881
19890
19900
19910
19921
19930
19940
19950
19961
19970
19985
19994
20002
20010
20022
20031
20040
20051
20060
20070
20081
20091
20100
20116
20121
20130
20147
20154
20161
20171
Total63