*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976001001
1977002002
1978000000
1979021003
1980011002
1981012003
1982000000
1983001001
1984000000
1985100001
1986021003
1987220004
1988033006
1989081009
199001210013
19911640011
19920940013
19930770014
199412490034
1995033110044
199624370052
19971971200110
199808760093
1999256120070
20002871600105
2001167120080
2002158230082
20030851900104
200401261500141
200511363600173
2006054210075
2007159360096
2008057370094
20090724600118
20100844600130
20110406800108
201201123500147
2013031230054
2014071150086
201501120013
2016002002
2017000000
Total161533548002097