*Excludes Observations that spanned multiple years

Pre 19703
19700
19710
19721
19730
19740
19750
19760
19770
19780
19790
19800
19810
19822
19830
19840
19850
19860
19870
19881
19890
19900
19910
19922
19931
19942
19950
19967
19973
19980
19993
20001
20010
20020
20032
20045
20054
200618
20071
200813
20093
201012
201114
20126
201331
20145
20152
20163
20170
201810
20193
20203
20216
20223
20234
20241
Total175