*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197000601622
1970000000
1971000000
1972000000
1973000000
1974000000
1975000011
1976000000
1977000000
1978000011
1979000011
1980001012
1981002024
1982000000
1983000000
1984001001
1985000011
1986011002
1987001012
1988002024
1989007007
1990004015
19912180011
199230160019
199331170122
199453220131
199561260437
199661210129
199702120115
199810200021
199921130117
20001070210
2001112340047
200274680079
200344140123
200415350344
2005304101449
200611100113
2007218150237
20080190010
2009004004
201000160016
2011008008
2012053019
20131640011
20140920011
20150840012
2016002002
2017000000
Total7688425150640