*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000505
1970000303
1971000000
1972000000
1973000000
1974000000
1975000011
1976000101
1977000404
1978000303
1979000314
1980001517
1981000303
1982000202
1983000202
1984000101
1985000202
1986000213
1987000516
1988000279
19890017715
1990000131629
199100561122
19920007815
1993000101222
1994000124557
1995006162547
1996003134662
199700312110125
1998000118394
19990008143151
200000114116131
200100412149165
200200135203239
200300021235256
200400328379410
200500148115164
200600291264357
200700168212281
200800876171255
2009006105362473
201000197194292
2011000105149254
201200339171213
2013000149302451
2014003111263377
2015001221235
2016000606
2017000011
2018000000
Total0054118538165055