*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000202
1970000000
1971000000
1972000000
1973000202
1974000000
1975000303
1976000101
1977000202
1978000101
1979000101
1980000213
1981000202
1982000202
1983000000
1984000101
1985000112
1986000101
198700012416
198800019019
198900022325
199000241521
199100361221
19920015252258
199300112535548
19940023114821515
19950001911781197
1996000813581366
199700113855869
1998001611221129
199900015213228
20000012011721193
200100017549566
200200325934962
200300028754782
20040002112181239
200500023441464
200600051520571
200700058846904
200800059441500
20090017152124
2010000160312472
2011000120215335
201200214284300
2013002150339491
2014000116253369
201500020525
201600091625
2017000000
2018000000
Total002011551538216557