2000

7.6

2003

6.3

1990

5.1

1998

7.5

2003

5.9

2003

6.7

1997

5.6

1986

5.9

1999

5.6

1968

7.5

1994

6.5

1996

6.1

2005

7.2

2001

4.7

2014

6.5

1971

7.5

2004

7.1

1997

6.7

1976

7.2

1993

7.2