*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970013004
1970003003
1971000000
1972000000
1973000000
1974001001
1975002002
1976002002
1977004004
1978012003
1979003003
1980115007
1981013004
1982014005
1983001001
1984003003
1985002002
1986014005
19871280011
1988114006
19893650014
199022560033
199191150126
1992718160142
19931559130087
199441902800222
199510961600122
199661471400167
199752641801288
199851781100194
199931891200204
2000112582300292
200172262301257
200223253400361
200365243400564
200438252200850
200543864500435
200663679300466
200794518500545
200865877500668
20091332011900452
20101639718100594
2011418520600395
201223227200396
201333544900406
201447514300798
2015215340051
201614130018
2017100001
Total17274891349049014