*Excludes Observations that spanned multiple years

Pre 197014
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19920
19930
19940
19950
19960
19970
19980
19990
20000
20010
20020
20031
20040
200517
200623
20072
20082
20092
20106
201136
20120
20138
20141
20152
20162
20170
Total116