*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19841
19850
19860
19871
19888
19892
199022
199113
199229
199322
199441
199575
199668
199780
1998107
199975
200041
2001158
2002321
200377
2004203
20053
200672
200735
200858
200914
201021
201114
201220
20132
20140
Total1583