*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970004015
1970000000
1971000000
1972000000
1973000000
1974000000
1975003003
1976002002
1977006006
1978001001
1979033006
1980031004
1981001001
1982005005
1983001001
1984002002
1985110002
1986024006
1987053008
1988016007
198906100016
199022190032
1991711180036
199221370022
1993358160077
199431682200193
19952911100104
1996101211000141
199774841600507
199825042000526
199922741100287
200024442600472
200113991700417
200203644201407
200344174100462
200415412300565
200504328100513
200624485300503
200704487200520
2008018210700289
2009011411300227
2010123616000397
2011028123300514
2012047510200577
201302639200355
201401671800185
201502160018
2016070007
2017000000
Total5269861388028428