*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19831
19840
19850
19869
19876
19880
19892
19901
19911
19925
199319
199414
199521
19962
199714
199813
19997
20000
20015
20026
20033
20044
200511
20064
20073
20089
20094
201014
201120
20121
20130
20141
20150
20162
20170
Total202