2018

5.7

1992

5.0

2010

5.2

1994

5.6

2004

7.1

2008

6.8

1986

3.0

2001

7.4

1991

5.7

2007

6.2

2006

6.3

2000

7.4

2002

6.2

1991

4.0

1970

3.8

1973

7.2

2003

6.6

1984

4.2

2001

6.7

2009

2.7