1966

6.2

2015

8.1

1984

5.6

1999

5.9

1989

5.5

2003

7.1

2017

7.3

1959

6.1

2018

8.0

1971

7.4

1993

6.6

1968

6.4

1968

6.5

1988

5.5

1993

4.6

2014

6.9

1985

7.2

1965

6.8

1964

7.0

1995

6.0