2000

6.3

1978

3.4

1999

7.0

2007

5.6

2010

5.8

1998

6.4

2013

6.4

1984

6.1

2014

7.0

2009

6.5

1994

6.5

1980

8.4

1987

7.5

2021

7.7

1981

7.0

2017

6.0

1952

8.3

2004

5.1