*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19851
19860
19870
19880
19891
19902
19913
19923
19935
19940
199521
19960
19972
19980
19990
20001
20010
20020
20033
20044
20056
20065
20072
20081
20095
201013
20115
20123
20136
20142
20155
20164
20179
20181
20192
20203
20211
20226
20233
20240
Total128