No chart image found

*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19721
19730
19740
19750
19760
19770
19780
19791
19800
19810
19820
19830
19841
19851
19860
198729
1988133
198911
199058
1991261
1992185
199394
199413
199595
199626
199719
199815
199953
200037
200124
200240
200315
200460
200510
200624
20074
200814
200923
2010159
2011125
201214
201334
201471
201575
201672
201770
201872
201964
20200
20210
Total2004