*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970413008
1970000000
1971000000
1972000000
1973000000
1974000000
1975002002
1976000000
1977000000
1978000000
1979000000
1980000000
1981000000
1982000000
1983000000
1984000000
1985000000
1986010001
1987011002
1988002002
1989022004
1990020013
1991072009
1992002002
199302210023
199408120083
199526350070
199613910041
199711440019
199807700077
199902130024
200017540080
200103140035
200209160198
200307820080
20040128000128
200521750024
200606750072
200702040024
200801260018
2009125170043
2010015130028
2011018230041
201201610219
201302480032
201406390072
2015004004
2016001001
2017000000
Total121011142041169