1994

6.5

2013

7.6

2016

6.9

2007

5.6

2000

6.9

2005

6.7

2007

6.7

1965

7.1

1981

6.9

1994

5.2

2005

6.7

1955

7.2

2012

6.3

1989

7.0

1986

6.4

2002

6.0

2010

5.2

2019

5.1

1928

7.3

2003

7.0