*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000011
1970000000
1971000000
1972000000
1973000000
1974000000
1975000101
1976000000
1977000000
1978000000
1979000101
1980000000
1981000000
1982000101
1983000000
1984000000
1985000202
1986000617
1987000538
1988000707
1989000718
199000031114
19910036211
199200242026
199300163239
1994000126476
199500462939
199600245056
199700471930
199800134852
19990013711
200000183746
2001002104658
200200193242
2003002144460
200400112760188
2005000191938
20060013361463
20070003764101
2008000323062
200900139242
2010001712395
201100242448
201200041418
201300113519
20140006612
201500110213
2016001102
2017000000
2018000000
Total00455626901297