*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000112
1970000000
1971000000
1972000000
1973000101
1974000000
1975000303
1976000101
1977000202
1978000000
1979200002
1980000112
1981000000
1982000202
1983000000
1984000808
1985000000
1986000101
198710017018
198800021021
198900028230
199000001313
1991000202
1992000145
19931004813
199410093444
19951002811
199600045458
19971004232237
19980004236240
19990002231233
20001012335339
20010009260269
200200016248264
200300014295309
20040004273277
200500112256269
200600014232246
200700016189205
200800033235
2009000662187
2010000157509666
201100013627163
201200003333
201300017926
2014001132337
201500015116
2016000202
2017000000
2018000000
Total80364435374192