1982

4.7

2020

7.4

1987

7.7

2002

6.8

2014

6.1

2003

7.9

2003

7.2

1986

7.7

1995

6.6

1964

7.9

1990

6.1

1996

6.4

1997

6.5

2010

3.5

1999

5.5

1997

6.4

2001

6.4

2004

6.6

2001

6.5

2009

7.9