1964

7.3

2002

6.3

2004

6.1

2003

6.3

1986

6.4

2017

7.5

2002

6.5

1981

6.4

1978

6.8

2007

6.2

1997

6.5

2001

5.6

2006

5.5

1960

6.3

2017

4.0

1991

7.3

1999

6.5

1986

6.3

1997

6.7

2002

5.9