*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19927
19931
199410
199529
199627
199712
199810
19991
20001
20015
200246
2003150
2004158
2005107
200615
20078
200813
200959
20104
20113
20128
20137
201418
201516
2016284
2017118
20180
20190
Total1117