1995

6.5

2003

5.3

2004

7.6

2001

6.3

1966

6.5

2004

6.1

2001

5.1

1987

6.9

1987

6.7

2000

7.3

2003

5.2

1995

5.4

1973

4.3

1990

5.4

2002

6.1

1986

6.1

2014

6.7

1982

6.2

1997

6.5

2004

7.1