1992

6.6

2001

5.6

2007

6.8

1976

5.2

2009

6.7

2009

2.0

1997

4.2

2016

4.1

1999

7.1

2015

5.0

1966

0.0

2020

8.2

2007

9.0

1989

8.0

1912

5.0

1952

0.0

1925

1.0

1983

6.0

1983

6.0

1984

6.0