Create a vector with the number of repetitions

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Andes
Andes 2017-2-5
评论： Andes 2017-2-6
Hello, I wouldlike to create a vectorwith the number of repititions of a number for example, I have this data:
clear all
clc
data = [ 1 2004 3 5;
2 2004 7 2;
1 2005 9 4;
2 2005 6 5;
3 2005 3 7;
4 2005 8 2] % Where data(:,1) is id and data(:,2) is year.
I would like to create a code that counts the numbers of id per year in a vector, just like this:
result = [2 2 4 4 4 4]';
thank you very much in advance.

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the cyclist
the cyclist 2017-2-5
编辑：the cyclist 2017-2-5
I feel like there must be a better way, but this will work
data = [ 1 2004 3 5;
2 2004 7 2;
1 2005 9 4;
2 2005 6 5;
3 2005 3 7;
4 2005 8 2 ] % Where data(:,1) is id and data(:,2) is year.
dataYear = data(:,2);
uniqueDataYear = unique(dataYear);
dataYearCount = histcounts(dataYear,[uniqueDataYear; Inf])
[~,loc] = ismember(dataYear,uniqueDataYear);
result = dataYearCount(loc)'

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