As we await results from the U.S. and China trade negotiations, it's important to remember the contributions each have to today's world economy. The U.S. is still far bigger, but the China is growing more quickly. This piece gives more information, but I'd like to point out something towards the end of it.
Because Apple is such a widely held stock, your allocation to that stock or funds that perhaps hold a lot of the company could have had a larger weight, or influence, on your portfolio performance. This is why diversification is not only important, but knowing what you own and why you own it (something Peter Lynch of Fidelity used to say). Essentially, if you aren't getting the results you want, you may need to look at what you own.