Selection of only yearly data on Google earth engine

GLDAS-1: Global Land Data Assimilation System band ( AvgSurfTsfc: Average surface temperature [K] ) provides daily data.I want to get this data as an annual average.

This is the script I'm using;

//GLDAS-1: Küresel Toprak Verisi var noahAvgSurfTsfc = ee.ImageCollection('NASA/GLDAS/V001/NOAH/G025/T3H').filterDate(startTime, endTime).select('AvgSurfTsfc'); noahAvgSurfTsfc = noahAvgSurfTsfc.map(function(image) { return image.addBands(image.subtract(273.15).select([0], ['S?cakl?k C°'])); });

var noahAvgSurfTsfc = ui.Chart.image.series(noahAvgSurfTsfc, plot, ee.Reducer.mean(), 30); noahAvgSurfTsfc = noahAvgSurfTsfc .setOptions({ title: 'Ortalama Yüzey S?cakl??? [K]', hAxis: {title: 'Aylar'}, vAxis: {title: 'S?cakl?k'}

});

print(noahAvgSurfTsfc);

I do not want to take this data everyday.I want to take it as an average year. Can ypu help me ? Thanks