'a value to become zero through loop in php

i am working on project to calculate depreciation till the values goes 1 or 0 but not go in negative. for eg: product value = 15 and rate of depreciation is 2 the result will come in this format.

| year2021| year 2022| year 2023 | year2024| year2025|year2026| year2027|
|-------  |------    | ------    |-------  |------   | ------ |-------  |
|15-2=13  |13-2=11   | 11-2=9    |9-2=7    |7-2=5    | 5-2=3  | 3-2=1   |

$value = 15; 
$dep_value=2;
$end=1;

for($i=$value-$dep_value; $i>=$end; $i--){
    if($i!=1) {
        echo "$i-";
    } else {
        echo "$i";
    }
} 

$year=2021;
$endyear=2026;
for($i=$year; $i<=$endyear; $i++){
    if($i!=1) {
        echo "$i+";
    } else {
        echo "$i";
    }
}

my project is in php but i didn't get desired result.

phploops


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