I'll be decreasing you'll be decreasing he'll be decreasing we'll be decreasing you'll be decreasing they'll be decreasing
Future perfect
I'll have decreased you'll have decreased he'll have decreased we'll have decreased you'll have decreased they'll have decreased
Future perfect continuous
I'll have been decreasing you'll have been decreasing he'll have been decreasing we'll have been decreasing you'll have been decreasing they'll have been decreasing
I'd be decreasing you'd be decreasing he'd be decreasing we'd be decreasing you'd be decreasing they'd be decreasing
Past
I'd have decreased you'd have decreased he'd have decreased we'd have decreased you'd have decreased they'd have decreased
Past continuous
I'd have been decreasing you'd have been decreasing he'd have been decreasing we'd have been decreasing you'd have been decreasing they'd have been decreasing