1974

7.0

1971

8.1

1987

7.1

1991

5.9

2003

6.6

2004

7.3

2007

6.3

2015

4.5

1891

4.1

2005

6.7

1966

6.2

2000

5.7

2002

5.8

2005

6.0

1998

5.0

2016

5.4

2017

6.8

1993

4.2

1967

7.2

2017

4.3