Array
(
    [Carl Lewis] => 1991
    [Leroy Burrel] => 1994
    [Donovan Bailey] => 1996
    [Maurice Green] => 1999
    [Tim Montgomery] => 2002
)
1<br><br>Array
(
    [Carl Lewis] => 1991
    [Leroy Burrel] => 1994
    [Donovan Bailey] => 1996
    [Maurice Green] => 1999
)
1<br><br>Array
(
    [Carl Lewis] => 1991
    [Leroy Burrel] => 1994
    [Donovan Bailey] => 1996
    [Maurice Green] => 1999
    [Asafa Powell] => 2005
    [Justin Gatlin] => 2006
)
1<br><br>Array
(
    [Carl Lewis] => 1991
    [Leroy Burrel] => 1994
    [Donovan Bailey] => 1996
    [Maurice Green] => 1999
    [Asafa Powell] => 2005
)
1<br><br>Array
(
    [Carl Lewis] => 1991
    [Leroy Burrel] => 1994
    [Donovan Bailey] => 1996
    [Maurice Green] => 1999
    [Asafa Powell] => 2005
    [Usain Bolt] => 2019
)
1<br><br>