1958

7.7

1993

7.1

2007

6.2

2004

7.5

1994

6.6

2005

6.2

2003

7.9

2007

5.2

1965

7.1

1978

6.2

1970

7.6

1977

7.4

1999

7.2

2002

6.2

1964

7.2

2002

6.3

2008

6.1

2004

7.1

2006

6.3

2017

6.3