*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197059003062
1970400206
1971400105
1972500106
1973600107
1974400105
1975600107
197610002012
197712002014
1978600006
197910001011
198013002015
198115000015
19828002010
198316003019
198417002019
198516004020
198613015322
1987150011127
1988170015032
1989140023138
1990161031434
1991111321945
199213029731
199312002788127
1994160157184258
1995121491176284
1996140045240299
19971200184777
199890037284
199950051424
200016018102127
2001150066990
2002700177195
2003702125980
20041000106080
200581014932
20061221123562
200712003270114
20089013097137
2009300381556
20105037370151
20111017655133
2012410116682
201300079483
2014000761692
2015100618
2016000505
2017000101
2018000000
Total50072086716553049