*Excludes Observations that spanned multiple years

Pre 197012
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19803
19810
19820
19830
19840
19852
19865
198730
198834
198920
19904
19913
19921
19934
199410
19954
19961
19971
19980
19990
20000
20013
20020
20038
200414
20053
20064
20074
20080
20090
20101
20110
201229
20131
20140
Total201