*Excludes Observations that spanned multiple years

Pre 19702
19700
19711
19720
19730
19740
19750
19765
19772
19782
19791
19801
19812
19820
19831
19840
19850
19862
19870
19880
19891
19901
19912
19924
199324
19946
199538
199647
199747
199828
19998
20003
20011
20023
20031
20047
20053
20063
20073
20081
20091
20101
20110
20120
20130
20140
20150
20160
20170
Total252