1989

6.3

2001

4.9

2000

7.0

2001

7.0

2004

6.1

2006

5.6

2017

5.8

1995

6.4

1989

5.9

2003

6.2

1999

6.2

2001

5.0

1962

7.3

2005

7.0

2008

6.6

1984

6.0

2018

6.3

2018

7.5

1996

6.8

1992

5.4