*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000101
1971000000
1972000000
1973000000
1974000000
1975000303
1976000101
1977000101
1978000000
1979000000
1980000000
1981000000
1982000202
1983000000
1984000101
1985000000
1986001023
1987000527
1988000213
198900115420
199000101415
1991000145
199200349198
19930003224227
19940027799808
19950003566569
19960001616617
19970004249253
19980013531535
19990013221225
200000113760774
20010002614616
200200011776787
200300210719731
20040002848850
20050024173179
200600015368383
200700130332363
200800014279293
200900030124154
201000051351402
20110004583128
20120024156162
2013001225169206
201400058215273
2015000415
20160004812
2017000000
2018000000
Total003038293009712