*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970003003
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979000000
1980000000
1981001001
1982010001
1983000000
1984020002
1985001001
1986002002
1987010001
1988012003
1989000000
1990041005
1991051006
1992001001
1993021003
199404310044
199504110042
199603110032
199701130014
199803420036
199905040054
200006020062
20010480012
2002071110082
200308930092
200407240076
200501230015
200605760063
200701231000133
200806870075
200902130024
2010033140047
2011025110036
2012053150068
2013015110026
20141131100133
2015102003
2016001001
2017010001
Total21061137001200