*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19883
19894
19903
199129
19923
199328
19948
19952
19961
199717
199814
19993
20001
200124
20025
20031
200411
20057
20064
20077
20087
20096
20108
201121
201222
201319
201417
201523
201619
201728
20180
Total345