*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19831
19840
19851
19861
19871
19880
19890
19902
19910
19923
19931
19940
19952
19960
19972
19981
19990
20001
20011
20020
20032
20041
20055
20062
20071
20082
20092
20104
20112
201211
20135
20143
20156
20162
20171
20185
20191
20200
20211
20224
20232
20240
Total80