*Excludes Observations that spanned multiple years

Pre 197015
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19823
19830
19840
19850
19860
19870
19881
19890
19900
19910
19920
19930
19940
19950
19960
19970
19980
19990
20000
20011
20020
2003108
200418
200542
20067
20077
20081
20096
20103
20110
20122
20131
20142
20156
20167
20170
20180
Total230