*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977001001
1978000000
1979000000
1980000000
1981000000
1982000000
1983001001
1984000000
1985002002
1986004004
1987004004
1988004004
1989007007
1990002002
199100100010
199200100010
1993006006
1994007007
199500100010
199600100010
1997004004
199800100010
1999009009
200000110011
200100100010
200200110011
2003004004
200400100010
200500160016
200600110011
200700150015
200800140014
200900110011
201000100010
201100170017
201200200020
201300160016
201400230023
201500350035
201600320032
201700270027
201800340034
201900410041
202000530053
202100530053
202200250025
2023001001
2024000000
Total0060100601