*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000303
1970000101
1971000000
1972000000
1973000000
1974000000
1975000202
1976000303
1977000303
1978000101
1979000101
1980000101
1981000314
1982000112
1983000000
1984000101
1985000101
1986000033
19870009413
1988000628
19890009817
199000123235
1991001112032
199200283242
199300015111126
199400220132154
199500120133154
199600314151168
199700019233252
19980026185193
199900016115131
200000039228267
200110318344366
200200031162193
200300129397427
200400018376394
200510267246316
200600141191233
200700053138191
200800062141203
200900171140212
2010001141108250
201100115950210
201200060129189
2013000336194
20140018661148
2015000211132
20160009716
2017000011
2018000000
Total2023111439545093