*Excludes Observations that spanned multiple years

Pre 197011
19700
19710
19720
19730
19740
19750
19761
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19920
19930
19940
19951
19960
19970
19980
19990
20000
20010
20027
20030
20047
200513
20060
20070
200811
200919
201019
20117
20125
20131
20140
20151
20160
20170
Total103