*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970001023
1970000000
1971000011
1972000000
1973000000
1974000011
1975000011
1976001023
1977105017
1978001012
1979006017
1980003014
1981003036
1982002013
1983000011
1984002013
1985002013
1986007029
1987106029
19882060210
198900170320
199024280337
199143240233
199211150320
199323370345
199403670676
199521390446
199686510267
1997079507109
199809820697
199925760992
20002411403123
20013089011103
200211700577
20031012605132
20040018705192
20050113604141
20060113506142
20070111604121
20081113302137
20099118701198
20108227000280
20116033603345
201221168010181
20130014407151
201400570057
201510320033
2016007007
2017000000
Total5955288301383135