*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970200002
1970000000
1971100001
1972000000
1973000000
1974000000
1975000101
1976100012
1977100001
1978100102
1979000101
1980100001
1981201407
1982000303
1983200103
1984000101
1985000202
1986500016
19872244113
19888033115
19896037117
1990601516138
19911511917456
199280920138
1993701222344
19941111815045
199541010116
199660613025
1997150715037
19981002016046
1999811315542
200060313123
2001901817145
200230823135
200390720440
200430421028
2005601310130
200670111019
2007150112129
2008100221134
200951814129
201010912022
201170628041
201210718026
2013100317434
2014100105465
20155058018
2016001102
2017000101
2018000000
Total220722644489986