*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970004026
1970000000
1971000000
1972000000
1973001001
1974000000
1975000011
1976000022
1977004004
1978002013
1979008019
1980007007
198100120113
198202100012
1983006017
1984004015
1985201003
1986107019
1987104016
1988205018
198921110014
199025140021
199153540062
199230160019
199334190228
1994212270142
1995155290049
19961212330057
1997412300147
199836210131
199916131122
200046240135
200173180129
200222250029
2003210380050
200414280033
200505400045
200672530264
200710630165
200822810186
200912910500126
201010613700153
20115318900197
20122211701122
201311710073
201400140014
201501120114
2016000000
2017102003
Total11512413591271626