1975

1.0

1982

6.1

1973

7.5

2002

6.7

2000

7.1

2002

7.3

1992

0.0

1999

6.7

1994

7.0

2006

7.3

2000

6.0

2003

7.2

2005

7.0

1989

8.3

1953

5.2

1971

6.2

2003

2.5

2015

0.0

1975

5.7

2015

5.7