*Excludes Observations that spanned multiple years

Pre 19702
19700
19711
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19822
19830
19841
19850
19863
19874
19880
19893
19902
19910
19920
19934
19948
19951
19960
19973
19980
19990
20000
20013
20020
20034
20043
200513
20065
20071
20087
20091
201046
201182
20126
201312
201416
20157
201620
20178
20180
Total268