*Excludes Observations that spanned multiple years

Pre 19705
19700
19713
19720
19730
19741
19750
19760
19771
19780
19791
19800
19811
19820
19834
19840
19853
198612
19876
1988122
19893
199010
1991132
1992122
1993131
199420
199556
199630
19976
19980
199956
200025
200149
200217
20034
200419
200511
20064
200711
200816
20097
20107
201116
20128
20132
20142
20154
20167
20176
201823
201929
202031
202161
202282
202355
202412
Total1233