You forgot to include the solution I provided! And let's include a basic use of sort to see what that looks like and how the others compare to that.

          Rate   basic     GRT      ST keysort
basic   1.66/s      --    -88%    -89%    -91%
GRT     13.3/s    701%      --    -12%    -25%
ST      15.1/s    810%     14%      --    -15%
keysort 17.7/s    972%     34%     18%      --

          Rate   basic     GRT      ST keysort
basic   1.79/s      --    -87%    -89%    -91%
GRT     13.5/s    654%      --    -15%    -30%
ST      15.8/s    786%     18%      --    -18%
keysort 19.3/s    980%     43%     22%      --

          Rate   basic     GRT      ST keysort
basic   1.70/s      --    -87%    -89%    -91%
GRT     13.3/s    681%      --    -15%    -27%
ST      15.6/s    817%     17%      --    -14%
keysort 18.3/s    972%     37%     17%      --
[download]

Sort::Key isn't only the cleanest and simplest of all the solutions (including the builtin sort), it's the fastest! It's 17-22% faster than the next fastest.

#!/usr/bin/perl
use strict;
use warnings;

use Benchmark     qw( cmpthese );
use File::Slurper qw( read_text );
use Sort::Key     qw( rikeysort );


my @unsorted =
   split /^(?=>>> )/m,
      read_text( "try3.txt" );

@unsorted = ( @unsorted ) x 10_000; # 90_000 lines (30_000 records)


sub basic {
   my @sorted =
      sort {
         my ( $an ) = $a =~ /(\d+)%/;
         my ( $bn ) = $b =~ /(\d+)%/;
         $bn <=> $an
      }
         @unsorted;
}


sub ST {
   my @sorted =
      map $_->[0],
         sort { $b->[1] <=> $a->[1] }
            map [ $_, /(\d+)%/ ],
               @unsorted;
}


sub GRT {
   my @sorted =
       map substr( $_, 4 ),
          sort
             map {
                /(\d+)%/
                ? ( ~ pack( "N", $1 ) . $_ )
                : ()
             }
                @unsorted;
}


sub keysort {
   my @sorted = rikeysort { ( /(\d+)%/ )[0] } @unsorted;
}


cmpthese( -3, {
    basic   => \&basic,
    ST      => \&ST,
    GRT     => \&GRT,
    keysort => \&keysort,
} );
[download]

Note: I found substr( $_, 4 ) to be slightly faster than unpack( "xa4", $_ ), thus the change in GRT.

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