*Excludes Observations that spanned multiple years

Pre 197011
19700
19710
19720
19730
19740
19750
19760
19770
19782
19790
19800
19810
19822
19830
19842
19850
19861
19870
19880
19892
19900
19910
19926
19935
19947
19954
199622
199720
19983
199924
200013
200128
200216
20037
200421
200598
2006115
200740
20082
20094
201039
20117
20124
20134
20141
20156
201618
201715
Total549