*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970400004
1970000000
1971300003
1972100001
1973200002
1974200103
1975300003
1976400004
1977300003
1978100001
19794007011
1980200103
1981400105
1982600006
1983000202
19845005010
1985300104
19866007013
19874009013
19888009017
19896005011
199050034039
199130038041
199240048052
199390050059
1994130047060
199540046050
199610043044
199750048053
199880031039
199990026035
200090029139
200170034041
200240049053
200340032036
200460033039
200560015021
200640021025
200760014121
200841026031
200940055059
201010046047
201120060062
201231018022
201310022023
2014000404
2015000202
2016000202
2017000000
2018000000
Total1932092121118