2013

7.7

1980

6.7

1990

6.1

2003

6.0

1983

5.5

1999

6.0

1993

6.5

2004

1.5

1984

6.1

1985

5.4

1965

6.1

1995

5.9

1986

6.8

2002

5.6

1994

6.2

1976

7.3

1982

6.8

2005

6.2

2006

6.1

1984

5.3