2006

7.4

2007

5.6

1985

5.8

1986

6.1

2002

6.8

1983

5.2

2010

4.6

1999

6.5

2001

5.1

2017

6.9

2005

5.3

1988

7.1

1994

4.1

1970

7.1

2006

6.3

1980

5.1

1969

4.3

1990

6.7

2001

7.3

1999

6.4