A Single core performance has improved by an average of 30% per year for the last five years.
Back the late nineties the rate of increase in cpu horsepower was phenomenal, every two years processor throughput was doubling. As clock speeds reached 3 and then 4 GHz the emphasis shifted from linear single processor speed to multi-threaded performance. There has been a relatively slow and predictable improvement in performance over the last five years and there is no longer the need to upgrade a CPU more than once every three years. In terms of single core performance, a reasonable proxy for real world performance, the late 2007 Core2 Duo E6550 scored 881 points on PassMark-S vs 2080 points achieved by the Mid 2012 Core i7 3770K, roughly a 140% increase in performance over the last five years or roughly a thirty percent improvement per year.

The Best.
CPUGPUSSD
Intel Core i7-8700K $370Nvidia GTX 1070 $379Samsung 850 Evo 250GB $104
AMD Ryzen 5 2600 $165Nvidia GTX 1060-6GB $230Samsung 850 Evo 500GB $106
AMD Ryzen 5 1600 $117Nvidia GTX 1080-Ti $808Samsung 850 Pro 256GB $93
HDDRAMUSB
Seagate Barracuda 1TB (2016) $45Corsair Vengeance LPX DDR4 3000 C15 2x8GB $95SanDisk Extreme 64GB $128
Seagate Barracuda 3TB (2016) $78G.SKILL Trident Z DDR4 3200 C14 4x16GB $711SanDisk Extreme 32GB $48
WD Blue 1TB (2012) $38Corsair Vengeance LPX DDR4 3200 C16 2x8GB $100SanDisk Ultra Fit 32GB $12
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